:root{--ink:#172031;--muted:#5d6879;--paper:#f7f6f1;--card:#fff;--line:#deddd6;--navy:#15315c;--blue:#315fcb;--coral:#ed714c;--green:#146c58;--shadow:0 18px 55px rgba(21,49,92,.11)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input{font:inherit}a{color:inherit}.site-header{max-width:1180px;margin:auto;padding:24px 28px;display:flex;align-items:center;justify-content:space-between}.brand{font-weight:800;text-decoration:none;letter-spacing:-.025em}.brand span{display:inline-grid;place-items:center;width:32px;height:32px;margin-right:9px;border-radius:9px;background:var(--navy);color:white}.site-header nav{display:flex;gap:28px}.site-header nav a{text-decoration:none;color:var(--muted);font-size:.92rem}.site-header nav a:hover{text-decoration:underline;color:var(--ink)}main{overflow:hidden}.hero{max-width:1180px;margin:0 auto;padding:58px 28px 90px;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(340px,.85fr);gap:72px;align-items:center}.eyebrow{margin:0 0 12px;color:var(--coral);text-transform:uppercase;letter-spacing:.13em;font-size:.75rem;font-weight:800}.hero h1{font-family:Georgia,serif;font-size:clamp(2.7rem,5.4vw,5.2rem);line-height:.98;letter-spacing:-.045em;margin:0;max-width:780px}.lede{font-size:1.17rem;color:var(--muted);max-width:650px;margin:24px 0 5px}.trust{font-size:.9rem;color:var(--green);font-weight:700;margin:0 0 26px}.calculator-card,.diagram-card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.calculator-card{padding:7px 24px 24px}.tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);margin:0 -24px 22px}.tabs button{border:0;background:transparent;padding:16px 10px;color:var(--muted);font-weight:700;cursor:pointer;border-bottom:3px solid transparent}.tabs button[aria-selected=true]{color:var(--navy);border-color:var(--coral)}label{display:block;font-size:.88rem;font-weight:750;margin-bottom:7px}.input-row{display:grid;grid-template-columns:1fr auto;gap:10px}.angle-field{display:flex;align-items:center;background:white;border:1.5px solid #b8bdc8;border-radius:10px;overflow:hidden}.angle-field:focus-within{outline:3px solid rgba(49,95,203,.25);border-color:var(--blue)}.angle-field input{width:100%;min-width:0;border:0;outline:0;padding:12px 8px 12px 14px;background:transparent}.angle-field>span{padding-right:12px;color:var(--muted)}.primary{border:0;border-radius:10px;padding:12px 20px;background:var(--navy);color:#fff;font-weight:800;cursor:pointer}.primary:hover{background:#23497f}.primary:focus-visible,.tabs button:focus-visible,.presets button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #f1a689;outline-offset:3px}.full{width:100%;margin-top:13px}.help{font-size:.8rem;color:var(--muted);margin:7px 0 13px}.presets{display:flex;align-items:center;gap:7px;flex-wrap:wrap;font-size:.78rem;color:var(--muted)}.presets button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:4px 9px;cursor:pointer;color:var(--navy)}.verify-fields{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:end}.verify-fields label{margin:0}.plus{font-size:1.4rem;padding-bottom:8px}.error{background:#fff0ed;color:#8d2919;border-left:4px solid var(--coral);padding:11px 13px;margin:15px 0 0}.result{margin-top:16px;padding:17px 18px;background:#eef8f4;border-left:4px solid var(--green);border-radius:4px 10px 10px 4px}.result.neutral{background:#f1f4f9;border-color:var(--blue)}.result-kicker{margin:0;color:var(--green);font-size:.7rem;text-transform:uppercase;letter-spacing:.12em;font-weight:800}.result h2{font:700 1.25rem/1.25 Georgia,serif;margin:2px 0 8px}.formula{display:inline-block;background:#fff;border:1px solid #d5e5df;border-radius:7px;padding:5px 9px;font-weight:800;margin:0}.result ol{font-size:.85rem;margin:10px 0 0;padding-left:20px}.diagram-card{padding:22px 24px;margin:0;background:linear-gradient(145deg,#fff 0%,#f0f3fb 100%)}.diagram-card svg{width:100%;height:auto;overflow:visible}.diagram-card figcaption{text-align:center;font-family:Georgia,serif;font-size:1.25rem;font-weight:700;color:var(--navy)}.base-line{stroke:var(--navy);stroke-width:4;stroke-linecap:round}.moving-ray{stroke:var(--coral);stroke-width:4;stroke-linecap:round}.arc-a{stroke:var(--coral);stroke-width:3}.arc-b{stroke:var(--blue);stroke-width:3}.label-a,.label-b{font-size:13px;font-weight:800;text-anchor:middle;dominant-baseline:middle}.label-a{fill:#a63f24}.label-b{fill:#244da9}.straight-label{font-size:11px;fill:var(--muted)}.definition,.split-section{background:var(--navy);color:#fff;padding:78px max(28px,calc((100vw - 1124px)/2));display:grid;grid-template-columns:.8fr 1.2fr;gap:80px}.definition h2,.content-section h2,.split-section h2{font:700 clamp(2rem,4vw,3.6rem)/1.05 Georgia,serif;letter-spacing:-.035em;margin:0}.definition p{margin-top:0;color:#d9e1ee}.definition strong{color:#fff}.formula-large{font:700 clamp(1.4rem,3vw,2.25rem)/1.2 Georgia,serif;color:#fff!important;padding:20px 0;border-top:1px solid #526985;border-bottom:1px solid #526985}.content-section{max-width:1180px;margin:auto;padding:88px 28px}.example-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:38px}.example-grid article{background:#fff;border:1px solid var(--line);border-radius:15px;padding:25px}.example-grid article>span{color:var(--coral);font-size:.73rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em}.example-grid h3{font-family:Georgia,serif;margin:8px 0 22px}.check{color:var(--muted);font-size:.85rem;border-top:1px solid var(--line);padding-top:12px}.split-section{background:#e8edf8;color:var(--ink);align-items:center}.split-section p{color:var(--muted)}.comparison{background:#fff;border-radius:15px;padding:10px 22px}.comparison p{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:12px 0;margin:0}.comparison p:last-child{border:0}.comparison strong{font:700 2rem Georgia,serif;color:var(--navy)}.compact{padding-bottom:35px}.text-columns{display:grid;grid-template-columns:1fr 1fr;gap:50px;margin-top:38px}.text-columns h3{font-family:Georgia,serif;font-size:1.35rem}.text-columns p,.text-columns li{color:var(--muted)}.faq{max-width:900px}.faq details{border-top:1px solid var(--line);padding:19px 0}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{font-weight:800;cursor:pointer}.faq details p{color:var(--muted);margin-bottom:0}footer{max-width:1124px;margin:auto;padding:42px 0 60px;border-top:1px solid var(--line);display:flex;align-items:center;gap:30px;color:var(--muted);font-size:.85rem}footer p{margin-left:auto}
@media(max-width:850px){.hero{grid-template-columns:1fr;padding-top:34px;gap:35px}.diagram-card{max-width:520px;width:100%;justify-self:center}.definition,.split-section{grid-template-columns:1fr;gap:28px}.example-grid{grid-template-columns:1fr}.text-columns{grid-template-columns:1fr;gap:15px}footer{margin:0 28px;flex-wrap:wrap}footer p{margin-left:0}.site-header nav{display:none}}
@media(max-width:520px){.site-header{padding:18px}.brand{font-size:.9rem}.hero{padding:24px 18px 65px}.hero h1{font-size:2.65rem}.calculator-card{padding:6px 16px 18px}.tabs{margin:0 -16px 18px}.tabs button{font-size:.82rem}.input-row{grid-template-columns:1fr}.primary{width:100%}.verify-fields{grid-template-columns:1fr}.plus{display:none}.definition,.split-section,.content-section{padding-left:18px;padding-right:18px}.diagram-card{padding:12px}.example-grid{gap:12px}footer{margin:0 18px;display:block}footer>*{display:block;margin:12px 0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}